Treatment Methods Participants will be randomized into one of two treatment groups, FES treatment or conventional UE training, using a matched pairs design. The children will be matched in pairs based on their Manual Ability Classification System level. This randomization method, which has been used in other studies working with a similar population, will remove bias in the comparison of the two groups by ensuring that a potential confounding variable (i.e., UE impairment) is equally distributed across groups. A Research Assistant who is not involved in this study will randomize the participants by picking a label out of a box. Both treatment methods will be provided by a single physical or occupational therapist at each site.